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Observer Synthesis for the Adhesion Estimation of a Railway Running Gear

Schwarz, Christoph and Keck, Alexander (2019) Observer Synthesis for the Adhesion Estimation of a Railway Running Gear. In: IFAC Proceedings Volumes (IFAC-PapersOnline), pp. 844-849. Joint Conference 8th IFAC Symposium on Mechatronic Systems (MECHATRONICS 2019), and 11th IFAC Symposium on Nonlinear Control Systems (NOLCOS 2019), 04.-06. Sep. 2019, Wien, Österreich.

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Abstract

The presented work illustrates an investigation on the observer synthesis for a highly nonlinear railway running gear system. The specific focus is on the longitudinal dynamics and the associated adhesion effects, i.e. the friction conditions between wheel and rail. This Interface strongly influences the brake and the traction performance of trains and, thus, its detailed consideration is of crucial importance in terms of safety and comfort. The observer design is accomplished for the experimental running gear developed at the German Aerospace Center (DLR). The article focuses on the first steps of the observer synthesis: (i) the set-up of the observer model, (ii) the selection of an appropriate observer method, (iii) and the validation of the observer in a simulation environment. The determining aspect of the model implementation is the consideration of the nonlinear wheel-rail contact. To cover this nonlinear behavior an Extended Kalman Filter (EKF) is used in combination with a parameter estimator for the friction characteristics in the wheel-rail interfaces. In the end, the received results prove that the observer accurately estimates the system behavior and provides reliable information on the adhesion characteristics and related longitudinal dynamics. Based on this findings one of the upcoming steps at the DLR is to validate the observer in the real-time environment of the test rig. Regarding the use of the presented approach in a train some significant improvements of traction control systems are enabled. A first application could be an enhanced brake control to narrow down the variance of brake distances in daily operation. Furthermore, an advanced usability of the condition based monitoring of traction and brake systems is facilitated with the additional information on the friction conditions.

Item URL in elib:https://elib.dlr.de/127684/
Document Type:Conference or Workshop Item (Speech)
Title:Observer Synthesis for the Adhesion Estimation of a Railway Running Gear
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schwarz, ChristophChristoph.Schwarz (at) dlr.dehttps://orcid.org/0000-0003-4882-0828
Keck, AlexanderAlexander.Keck (at) dlr.dehttps://orcid.org/0000-0002-2956-8340
Date:September 2019
Journal or Publication Title:IFAC Proceedings Volumes (IFAC-PapersOnline)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Page Range:pp. 844-849
Status:Published
Keywords:Rail traffic, nonlinear systems, adhesion, Extended Kalman filter
Event Title:Joint Conference 8th IFAC Symposium on Mechatronic Systems (MECHATRONICS 2019), and 11th IFAC Symposium on Nonlinear Control Systems (NOLCOS 2019)
Event Location:Wien, Österreich
Event Type:international Conference
Event Dates:04.-06. Sep. 2019
Organizer:IFAC
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Rail Transport
DLR - Research area:Transport
DLR - Program:V SC Schienenverkehr
DLR - Research theme (Project):V - NGT BIT
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of System Dynamics and Control > Vehicle System Dynamics
Deposited By: Schwarz, Christoph
Deposited On:07 Jun 2019 11:05
Last Modified:23 Sep 2019 09:17

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